Combination spot and flood light



Feb. 19, 1935. T. HALL COMBINATION SPOT AND FLOOD LIGHT Filed Nov. 20, 1929 2 Sheets-Sheet 1 Magm Feb. 19, 1935. T. HALL COMBINATION SPOT AND FLOOD LIGHT Filed Nov. 20, 1929 2 Sheets-Sheet 2 INVENTOR Ziggdore filZZ j V @Wfin Patented Feb. 19, 1935 g 7 991,744 N c COMBINATION sPo'r i iloon near ebfdoi'e' haunts York, asfsf enbr to i Hall hConiioIly; I'n'c., New York, N. I, a "cor poration fif New-York y 'AhplicationNovenrbe'riZO, E59, Sci-i 1 lilo. 408,432

1'1 (crummy This invention relates to searchlights, rnot'ien 10. Both mechanisms a're. actuated from autopicture studio lights, "or othe'rrefiectdr lights, maticmeans the base '11 through telescoping whichmay be used interchangeahly fori s'potor universal::shafts:.-12 and 13. Both electrode holdfioodglightsl Where only moderate beam "spread ers' are. mounted on a frame 14 which is sup- :5 is desired as in searchlights, it is theu'sual mac: ported' on thetop 'of control box 11.

tice to move the light source toward the reflec'tdr In order to vary the spread of the beam, the fromtheiocalgpoint tospr'ead the team. where entire lamp mechanism isxadjustzbly mounted a 'largerbeam spread is desired, method canwithin "th'edrum. as by 'sli'da-bh mounting box 11 notbe used. as it is not practicable to the on rhollow parallel: shaftsrl2 extending longim arcing face .of the electrodes Very close toithe tudinally through the base of the drum. Each reflector. In such case I.-propose to move the of 'said-shaftsextends through lugs 13 and 14 light. source. away from. thefocal point-soas-to projecting from o'ppositesides of the box. A cross. the beam at some .point between thelight stop; collar "l-5 is secured to at least one of said source and they-field to be illuminated-t By my shafts to stop-the lamp'mechani'sm when the are 1-5 improved method, -I also relatively "move the light has advanced. to the focal position of the refiec- 15 source orlamp andthe. reflector so that the lamp tor. hd-justn'renirof the lamp is secured by tum-i is positioned to one side of the opticalaxis of the ing handle .16 on threaded. shaft '17 which exreflector as it. is. moved away fromthe same and tends: withirr'shaft 12''. A toothed latch l'l'sethereby avoid the castingoi a large 'shadow by cured to the .top of box 11 extends through a thelampmechanism which would-o'therwise-ihslot :18 in shaft 12''. and normally engages the 20 creasewiththe spread of the beam. threads on shaft 1'7=, but saidlatch maybe dis- Referring to the drawings in which several engaged; for: quick. adjustment 'by pullirigupformsof the invention are showmwardlyon fingeripiece 19..

Fig-1 is a.verticalrsectionthrough thesearchstated ahove', .I p'refer to provide a means 26 lighter floodl-ight; most of the lamp mechanism, for movingthe lamp" relative. downwardly with however, :being shown in elevation. I respec'tte the 'beamraxisat the time it is moved Fig. 2 is a detailed. viewof a modified formmi backwardlyte 'spreadithe beam, the purpose beraisingrand lowering mechanism-for the i'anlp.- mg best. explained'by reference to Figs..4,.5 and "6. Fig.3 is a. detail/on an enlarged scale of b. If the lampais .moved rearwardiy in the beam 80 portion of. Fig; 1. i

Fig. :4 is a. diagram showing how the spread beamwill Ice-obtained if the spread is not spreadrby backwardm'ovementof the lamp very great as shown in Fig. 4, the beam crossing thetocalmoint... i at C well-behind the iamp mechamis-m; =If,-how'-' Fig. 5 is a diagram showing howa shadow -is even-more spread is desired; the-pointof crossaxis from its focal positionmafairly satisfactory 3o;

36. avoided by my invention when a largeloeam in; movesi up close to or iintersects the lamp;

spreadis desireda. t thereby castinggalarge. shadow. By movinggthe Fig-fishows a modified form of. iny-invention larno downwardly however, in Fig 5 and joy in diagrammatic form. inclining the negative electrode 9 at a substan- Fig; .7 isa'detail showirigan automatic method tial angle, the lamp mechanism 'may be noved 40 of adjusting themirror. in the formsoil thei-ine out of the reflected. Beam and a 'shadowl'ess vention shown in. Fig. 6. sbread li'am 01otain'ed. 'Or,. i;ns:tad of Fig. 8 is. an enlarged. detail of the chain catch. the ramp, .the beam. axis-may be raise as'by shown'in Fig. 1. tiIti'IigiiowaTdIYthereflector'as'inFig. 'e'so a'stb. I have. shown'my invention as applied toja. secure the same result.

46 studiolightrhavizig.areflector l housingor 'One methodhf efiecfing' the ownward-mave- 2, ahdthewarelamp 3. The lamp is preferably merit oi thefla'ihpis'showh in Jourfialed of thehighdntehsitiz type in which .the. crater on thefbase ll isfa sprocllfe't wheel lZOto'Which is or face 4 of the positive carbon :5 is theprincipal: secured"? "chain- 21 which is detachabiy secured light source normally located; at therocal point at itsjout'er efidto thefront of the housing 2;a's

50 of the reflector to project a parallel beam. The. by 2'2. the shaft -"of said spro'cke't is 50 positive electrode 'hoider is' providedlwithr c'oeling. secured a cram; arm 23 (seealso 3) birthed ribs 6 andwith rotating. and feeding mechanism Hear itsr'ree to upright l i'nk =24 which-in "turn '7 and 8, all of which covers a sizable areavand ispivbted-atitsupperefid to a-liig 25 extending causes asmallblindspotinthe beam.. The negirfrol'm-Iramefi the-lamp Said Mg 25 an 66 tiveielectrode'91likewisehas feeding-mechanism aperturetmot showmxthrough which a post 26 extends which rises from box 11 and may be braced by bracket 27. A similar apertured lug 25' extending from the bottom of frame 14 engages the lower end of the post. Small guide posts 28 and lugs 29 may be provided at the other end of frame 14 to prevent swivelling.

From the foregoing, the operation of my invention should be apparent. When the lamp is at the focal point, it is against collar 15 and is at the same time raised to and kept in position by sprocket wheel 20 and chain 21 through the linkage described. As the lamp is drawn rearwardly to spread the beam by turning crank 16, sprocket 20 moves toward the front of the drum,

slackening the chain, and thus allowing the lamp to descend slowly by gravity. As the lamp is thus moved, frame 14 will finally come to rest on top of box 11, in which position the shadow is avoided as in Fig. 5. Further movement will only result in slackening the chain within changing the elevation of the lamp. Similarly in moving the lamp forwardly the elevating mechanism will not come into operation until the slack is taken out of the chain and the point at which this occurs may be altered by changing the effective length of chain at catch 22. The amount of raising of the lamp may also be adjusted by changing the location of the pin connecting crank 23 and link 24 from hole 30 to hole 31 or otherwise.

The lamp may be locked in any desired vertical adjustment by turning the clamp screw 33 on a bracket 34 supporting sprocket 20 so as to prevent rotation of the sprocket wheel. At the same time the chain should be disconnected at catch 22. This may be done as shown in Fig. 8 by raising the cover of the catch and lifting the chain 20 off lugs 22' on the base of the catch.

In Fig. 2 I show a modified means for raising and lowering the lamp mechanism as it is moved back and forth. According to this form of the invention a cam 35 is mounted on the shaft 36 of the gear 3'7. Gear 37 meshes with a rack 38 which is moved back and forth with the lamp. The cam may be shaped so as to elevate the lamp in steps if desired rather than in a gradual continual movement as the lamp is advanced to the focal point. 4 Thus the cam is divided into a series of concentric steps 39, 40, 41 each raised above the preceding step by an inclined portion 42.

Instead of lowering the lamp mechanism with respect to the axis of the beam, it is obvious that the beam may be relatively raised with respect to the lamp mechanism and the same advantages secured. This may be conveniently accomplished by tilting the reflector rearwardly as shown in Figs. 6 and '7. The reflector is shown as hinged at 36 to the housing 2' so that it may be tilted backwardly Within the limits of the slot 37 in the link 38'. An annular housing 39 is shown to prevent the escape of light when the mirror is inclined, the catch 40 being provided to hold the mirror normally vertical. A mechanical connection to adjust the mirror in accordance with the position of the lamp mechanism may be provided by running a cable or chain 39" from the front of lamp box 11 around pulleys or sprocket wheels 42, 40" and 41 and to the back of the reflector i. As the lamp is moved rearwardly to the focal point, therefore, the chain will draw the mirror into its upright position, where the beam axis coincides with the axis of the drum,

while when the lamp is moved to the left to spread the beam, the chain slackens and the reflector becomes inclined under the action of gravity and/or of spring 43.

In accordance with the provisions of the patent statutes, I have herein described the principle and operation of my invention, together with the apparatus which I now consider to represent the best embodiment thereof, but I desire to have it understood that the apparatus shown is only illustrative and that the invention can be carried out by other means. Also, while it is designed to use the various features and elements in the combination and relations described, some of these may be altered and others omitted without interfering with the more general results outlined, and the invention extends to such use.

Having described my invention, what I claim and desire to secure by Letters Patent is:

1. In a reflector are light, a reflector, an arc lamp mechanism normally positioned with the are at the focus of said reflector and the main body of the mechanism on the opposite side of the are from the reflector, means for adjusting the lamp away from the reflector to spread the beam, and means for automatically lowering said lamp as itis adjusted to mmimize the shadow from the lamp.

2. In a reflector are light, a reflector, an arc lamp mechanism normally positioned with the are at the focus of said reflector and the main body of the mechanism on the opposite side of the arc from the reflector, means for adjusting the lamp away from the reflector to spread the beam, and means brought into action by said firstnamed means for simultaneously moving said lamp to one side of the optical axis of the reflector to minimize the shadow from the lamp.

' 3. In a reflector are light, a reflector, an arc lamp mechanism normally positioned with the are at the focus of said reflector when a parallel beam is desired, the main body of the mechanism lying on the opposite side of the are from the reflector, means for moving the lamp and focus away from each other to spread the beam, and means brought into action by such movement of the lamp for also adjusting the relative position of the lamp and beam axis to place the lamp substantially without the spread beam.

4. In a reflector are light, a reflector, a lamp and lamp mechanism normally positioned with the are at the focus of said reflector when a parallel beam is desired, the main body of the mechanism lying on the opposite side of the are from the reflector, means for moving the lamp and focus away from each other to cross the beam between the lamp and the object illuminated, and means for automatically, relatively lowering the lamp with respect to the beam axis to minimize the shadow from the lamp.

5. In a reflector are light, a reflector, an arc lamp mechanism normally positioned with the are at the focus of said reflector, means for adjusting the lamp away from the reflector to spread the beam, the main body of the mechanism lying on the opposite side of the are from the reflector means for automatically lowering said lamp as it is adjusted to minimize the shadow from the lamp,'and means for locking the lamp at any desired elevation.

6. In a reflector are light, a reflector, an arc lamp mechanism normally positioned with the are at the focus of said reflector when a parallel beam is desired, the main body of the mechanism ly-' ing on the opposite side of the are from the reflector, means for moving the lamp away from said focus to spread the beam, and a connection between said lamp and reflector for altering the position of the reflector to raise the beam above the lamp to avoid a shadow therefrom when the lampis moved rearwardly to spread the beam.

'7. In a reflector are light, a drum, a reflector, a lamp box, a pair of electrode holders, a common supporting frame for said holders mounted for raising and lowering on said box, means for slidably mounting said box within the drum whereby adjustment of the box along the axis of the reflector may be made, and a common means for sliding said box and raising and lowering said frame in a predetermined ratio.

8. In a reflector lamp, a reflector, an arc lamp mechanism having positive and negative electrode holders, the latter being inclined with respect to the former, means for adjusting the relative axial position of the arc and reflector to spread the beam, and a mechanical connection between said first-named means and said lamp for adjusting such relative position laterally to place both electrode holders without the beam when spread.

9. In a high intensity reflector are light, a drum, a reflector, a lamp box containing power means, a pair of electrode holders having feeding means for the electrodes and rotating means for one of said electrodes, telescopic driving connections for driving said feeding and rotating means for said power means in said box, a supporting frame for said holders vertically adjustable on said box, and means for adjusting the position of the box in the drum toward and away from the reflector and simultaneously raising and lowering said frame on said box in a predetermined ratio.

10. In a reflector arc light, a reflector, an arc lamp mechanism normally positioned with the arc at the focus of said reflector and the main body of the mechanism on the opposite side of the are from the reflector when a parallel beam is desired, a common support for said reflector lamp and lamp mechanism means for pivoting the reflector on said support adjacent one edge thereof, and a common means for moving said lamp away from said focus and for tilting said reflector rearwardly on said pivot for the purpose specified.

11. In a reflector are light, a reflector, an arc lamp mechanism normally positioned with the are at the focus of said reflector, and the main body of the mechanism on the opposite side of the are from the reflector, means for adjusting the lamp and reflector away from each other to spread the beam, and means operated by the first-named means for lowering said lamp with respect to said reflector to minimize the shadow from the lamp.

THEODORE HALL. 

